Marc W. Miller (born 1947) is a game designer who was one of the founding partners of GDW Games and one of the original designers of the Traveller role-playing game. He is currently the owner of Far Future Enterprises.

Marc Miller's rather unorthodox title of Spiritual Advisor on the Journal's masthead has prompted some to write to ask what it is Marc does for (or to) the Journal. Aside from occasionally glancing at articles in various stages of completion, Marc normally does not see each issue until shortly after it is printed, at which time he presents me (Loren Wiseman) with a number of compliments and criticisms in the form of marginal notes. Now and then, Marc writes articles. Often, these are published.